What happens if you pass a column name of "^.*$"? Will it return all
columns? I don't think it will. IIRC the regex can only be applied to
the column qualifier portion of column name which means you'd have to
write out a column spec. for your mapreduce job per column family. So,
if you had three famlies but each had a thousand columns, if you write a
column specification of "family1:.* family2:.* family3:.*", that should
return them all.
I took a quick look. It should be the case that an empty string returns
all columns of a row but currently at least, it'll fail on line #75 in
TableInputFormat:
if (colArg == null || colArg.length() == 0) {
Try removing the colArg.length(). Maybe it'll work then? (You'll pass
in an array of columns of zero-length -- I think that'll work).
Meantime, open a JIRA Eric. Seems like a basic expectation, that there
be a way to get all columns in an MR.
St.Ack
Erik Holstad wrote:
Hey!
Yes I did find that line in HAbstractScanner.java but not really sure
how to use it to do what I want to do.
Regards Erik
On Sun, Oct 19, 2008 at 7:43 AM, Jean-Daniel Cryans <[EMAIL PROTECTED]>wrote:
I think you are looking for this :
// Pattern to determine if a column key is a regex
static Pattern isRegexPattern =
Pattern.compile("^.*[\\\\+|^&*$\\[\\]\\}{)(]+.*$");
J-D
On Fri, Oct 17, 2008 at 9:39 PM, Erik Holstad <[EMAIL PROTECTED]>
wrote:
Hi!
I'm trying to figure out how to get all the columns in a Map-Reduce job
without having to specify
them all?
Found the line:
@see org.apache.hadoop.hbase.regionserver.HAbstractScanner for column
name
* wildcards
in TableInputFormat.java but didn't find any help over in the HAbScanner.
Regards Erik
